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![Figure 3. Circuit Diagram [2] : Solar Powered Mobile Power Bank Systems : Science and Education Publishing | Circuit diagram, Powerbank, Solar power bank](https://i.pinimg.com/originals/81/d8/05/81d805f0de5b0ae469efb62e5e88ca15.png "Figure 3. Circuit Diagram [2] : Solar Powered Mobile Power Bank Systems : Science and Education Publishing | Circuit diagram, Powerbank, Solar power bank")